Polar and dispersive forces
By measuring the contact angle with two liquids, one polar liquid (such as water) and one apolar liquid (such as methylene iodide), the surface energy can be divided into two components, dispersive and polar.
This gives a measure of how many polar and dispersive (non-polar) groups there are at the surface. The introduction of polar groups in an otherwise non-polar surface will produce a surface that is amphiphilic i.e. the surface combines both hydrophilic and hydrophobic properties.
Intersleek®900 provides such an amphiphilic surface. Marine fouling organisms secrete an adhesive, either of a hydrophobic or hydrophilic nature depending on the fouling species. By having a balanced amphiphilic surface we can minimise the chemical and electrostatic adhesion between the surface and a wide range of fouling organisms.